Liquid silicone with high viscosity is indeed more likely to produce bubbles during processing. This is mainly because during the stirring, injection and curing processes of high-viscosity liquid silicone, due to its high viscosity, it is easy to mix with air or gas, and these gases are difficult to completely expel during processing.
Specifically, liquid silicone will introduce air and form bubbles during the stirring process. If the viscosity of the silicone is high, these bubbles are more difficult to eliminate by natural degassing or simple mechanical stirring. In addition, during the injection process, the poor flow of high-viscosity silicone may also cause gas to be trapped in the silicone and form bubbles.
These bubbles will remain inside the product after the silicone is cured, forming pores or cavities. These pores will not only affect the appearance quality of the product, such as causing the surface to be rough and defective, but also affect the physical properties and service life of the product. For example, pores will reduce the tensile strength and tear strength of the product, increase the shrinkage rate of the product, and may even cause the product to break or break during long-term use.
Therefore, when processing high-viscosity liquid silicone, special attention should be paid to the exhaust problem. Vacuum degassing and other process measures can be taken to remove bubbles in the silica gel to ensure the quality and performance of the product. At the same time, the viscosity of the silica gel needs to be reasonably controlled to minimize the processing difficulty and cost while ensuring the performance of the product.